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White matter is located at the base of the brain between the cerebellum and the brainstem. It is made of long nerve fibers called axons. The axons are insulated by myelin, sheaths of fat that give the region the white color for which it is named. The myelin helps speed up the transmission of signals along the axons.
Gray and white matter. The brain of humans consists of gray matter and white matter. The gray matter contains the nerve cells. White matter-myelin. The white matter of the brain is composed of nerve fibers and myelin. The nerve fibers form the connections between the nerve cells. Myelin is a fatty sheath wrapped around nerve fibers. The myelin sheath has two functions: insulation and acceleration of impulse conduction.